2 **********************************************************************
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3 * Copyright (c) 2002, International Business Machines Corporation
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4 * and others. All Rights Reserved.
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5 **********************************************************************
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6 * Date Name Description
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7 * 01/14/2002 aliu Creation.
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8 **********************************************************************
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11 package com.ibm.icu.text;
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14 * <code>UnicodeReplacer</code> defines a protocol for objects that
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15 * replace a range of characters in a Replaceable string with output
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16 * text. The replacement is done via the Replaceable API so as to
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17 * preserve out-of-band data.
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20 interface UnicodeReplacer {
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23 * Replace characters in 'text' from 'start' to 'limit' with the
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24 * output text of this object. Update the 'cursor' parameter to
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25 * give the cursor position and return the length of the
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28 * @param text the text to be matched
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29 * @param start inclusive start index of text to be replaced
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30 * @param limit exclusive end index of text to be replaced;
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31 * must be greater than or equal to start
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32 * @param cursor output parameter for the cursor position.
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33 * Not all replacer objects will update this, but in a complete
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34 * tree of replacer objects, representing the entire output side
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35 * of a transliteration rule, at least one must update it.
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36 * @return the number of 16-bit code units in the text replacing
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37 * the characters at offsets start..(limit-1) in text
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39 public abstract int replace(Replaceable text,
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45 * Returns a string representation of this replacer. If the
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46 * result of calling this function is passed to the appropriate
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47 * parser, typically TransliteratorParser, it will produce another
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48 * replacer that is equal to this one.
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49 * @param escapeUnprintable if TRUE then convert unprintable
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50 * character to their hex escape representations, \\uxxxx or
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51 * \\Uxxxxxxxx. Unprintable characters are defined by
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52 * Utility.isUnprintable().
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54 public abstract String toReplacerPattern(boolean escapeUnprintable);
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57 * Union the set of all characters that may output by this object
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58 * into the given set.
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59 * @param toUnionTo the set into which to union the output characters
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61 public abstract void addReplacementSetTo(UnicodeSet toUnionTo);
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